Dual coupling reamer handle

ABSTRACT

A surgical tool handle comprising a tool attachment coupling having locking piston subassembly is described. The attachment coupling is designed with a bayonet-type fitting having a series of coupling grooves constructed to accept surgical cutting tools having an attachment member of different cross-sectional geometries. More specifically, the attachment coupling comprises a coupling groove that accepts tool attachment members having both curved and rectangular cross-sectional geometries. In addition, a locking piston subassembly biases against the surgical tool attachment member received in the coupling groove to further stabilize the tool during a surgical procedure.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation application of U.S. non-provisionalapplication Ser. No. 16/032,188, filed Jul. 11, 2018, the entiredisclosure of which is incorporated herein by reference.

FIELD

This invention relates to surgical tool handles, and more particularly,to handles for rotary surgical cutting tools.

BACKGROUND

Surgical cutting tools such as orthopedic reamers and patella cuttersare used extensively in a variety of surgical procedures to cut bone andtissue. In many cases, because of the high cost of these surgicalcuttings tools they are often reused from patient to patient. Therefore,in order to minimize risk of infection or disease, it is important thatthese surgical tools and their respective holders be kept clean andsterile before any use in a surgical procedure.

A surgical tool, for example for preparing the acetabulum for a hipprosthesis, works in a medium that can cause considerable soiling of thetool and its handle. Despite the importance of doing so, thoroughcleaning of these devices is difficult. Surgical tool handles of theprior art are designed such that washing and rinsing are generally notan effective way of cleaning the tool. This is typically due to thesmall spaces left between component parts which allow only minimalaccess by cleaning agents. Therefore, to improve the effectiveness ofcleaning the surgical tool, it is often desirable to construct thesecutting tools such that the cutting end is detachable from its handle.Thus, by removing the handle from the cutting end, a more thoroughcleaning is generally achieved.

In addition, during a surgical procedure, it is also often desirable tointerchange a tool handle with a variety of cutting devices. The abilityto connect a handle with a variety of different cutting devices providesthe surgeon with increased flexibility in removing tissue and bone.However, since cutting tools, such as reamers, often comprise manydifferent handle connection interfaces, there is a need to provide atool handle that is capable of securely attaching to a variety ofdifferent cutting tools. For example, some surgical cutting tools have ahandle connection interface or attachment member comprising a crossbarwith a curved or round cross-section while others may comprise anattachment member having a rectangular cross-section. Therefore, thereis a need to securely connect a cutting tool of a variety of differentattachment member geometries to a handle to facilitate manipulation ofthe tool within the body.

Furthermore, during surgical use a significant amount of stress andpressure is often applied to the reamer tool to facilitate cutting ofbone and/or tissue. Because of this, it is important for the reamer andother surgical cutting tools to remain solidly secured to its handle asthe tool is manipulated within the body. If, for example, the reamer orother cutting tool were to move or become loose from its handle, bone ortissue may be unintentionally cut. Therefore, it is important tominimize movement or play of the cutting end portion connected to ahandle as unexpected movement of the cutting tool may result inundesirable surgical complications to the patient. For example, a handledesigned to receive a cutting tool having an attachment member of acurved cross-sectional geometry generally cannot receive and secure acutting tool comprising an attachment member of a rectangularcross-section.

Typically, existing tool handles are designed to connect to a surgicalcutting tool having an attachment member of a specific geometry.Generally, these handles are designed to connect a surgical cutting toolhaving an attachment member of either a round cross-section or arectangular cross-section, but not both.

U.S. Pat. No. 7,115,119 to Desarzens, the contents of which areincorporated herein and, in addition, which is assigned to the assigneeof the present invention, discloses a tool handle comprising a toolcoupling designed to receive a surgical tool having a tool attachmentmember of either a round cross-section or a rectangular cross-section.As shown in FIG. 2 of the '119 patent to Desarzens, the attachmentcoupling comprises a recess having both a rectangular and a curvedshaped portion. More specifically, a portion of the recess opening isdesigned to have both a rectangular and a curved cross-section so that atool attachment member of either a round cross-section or a rectangularcross-section can be received. Spring loaded collar pins positionedwithin the perimeter of the base of the coupling provide support for theattachment member when positioned within the coupling.

While the tool coupling described by the ′119 patent to Desarzens isacceptable for connecting to cutting tools having both curved andrectangular cross-sectional attachment geometries, additional work hasbeen performed to develop a tool handle locking mechanism that duringuse further minimizes movement and play of the surgical tool connectedto the handle. In addition to providing a tool handle with an improvedlocking mechanism, the surgical tool handle of the present inventionprovides structure for connecting to cutting tools having attachmentmembers of both rectangular and curved cross-sectional geometriesseparately or simultaneously. Thus, the present invention provides animproved tool handle that minimizes movement and play of a connectedcutting tool during use, thereby providing a robust connection betweenthe tool and the handle.

SUMMARY

A surgical tool handle aids a surgeon in controlling the use of acutting tool during surgery, for example, during preparation of afemoral cavity for reception of a hip joint prosthesis. The presentinvention describes such a surgical tool handle, but is adapted tosecure cutting tools having a variety of attachment members of differentcross-sectional geometries. That way, the present tool handle allows forsecure attachment of a multitude of cutting tools regardless whethertheir attachment member has a round and/or rectangular cross-section.

The present surgical handle comprises a shaft providing an end ontowhich the attachment member of a surgical tool is coupled. The shaftextends from a proximal shaft end to a distal shaft end supporting acoupling. The distal coupling comprises a bayonet fitting in which theattachment member of a cutting tool such as a reamer can be attached.The distal coupling is designed with sidewall openings comprising bothround and rectangular cross-sections that are spaced apart from eachother, thereby enabling surgical tool attachment members of bothgeometries to be received at one time, if desired.

A slidable collar positioned on the shaft provides a series of collarpins that impinge and secure the attachment member of the surgical toolwithin the coupling of the surgical handle. In addition, the attachmentmember of the surgical tool is further secured to the distal end of theshaft using a piston that resides within an end of the shaft. A biasmember residing circumferentially around the body of the piston providesa bias force that helps secure the attachment member within the couplingof the surgical handle. This attachment mechanism of the presentinvention provides a secure, but removable means of attaching a cuttingtool or reamer to a reamer handle.

These features of the present invention will be apparent uponconsideration of the following detailed description in connection withthe following drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an embodiment of a surgical tool handleassembly of the present invention.

FIGS. 1A and 1B illustrate embodiments of a surgical tool havingdifferent attachment member cross-sectional geometries.

FIG. 2 is a magnified perspective view of an embodiment of a couplingfor the surgical tool handle shown in FIG. 1 .

FIG. 3 is a perspective view of an embodiment of the coupling for thesurgical handle shown in FIG. 1 receiving an attachment member of arectangular cross-section.

FIG. 3A is a side elevational view of the coupling of the surgicalhandle shown in FIG. 1 without the attachment member of a surgical tool.

FIG. 4 is an enlarged perspective view of the coupling for the surgicalhandle shown in FIG. 3 having secured the attachment member of arectangular cross-section in position.

FIG. 4A is a side elevational view of the coupling for the surgicalhandle shown in FIG. 4 .

FIG. 5 is a perspective view of an embodiment of the coupling for thesurgical handle shown in FIG. 1 receiving an attachment member of acurved cross-section.

FIG. 5A is a side elevational view of the coupling for the surgical toolhandle shown in FIG. 5 .

FIG. 6 is a side elevational view of the slidable collar residing at thedistal portion of the surgical tool handle assembly of the presentinvention.

FIG. 7 is a cross-sectional view of the surgical tool handle assemblyillustrated in FIG. 6 .

DETAILED DESCRIPTION

Referring now to the drawings, FIG. 1 illustrates an embodiment of asurgical tool handle 10 of the present invention. As shown, the surgicaltool handle 10 comprises a shaft 12 extending along a longitudinal axisA-A from a shaft proximal portion 14 to a shaft distal portion 16. Acoupling 18 is connected to an end of the shaft distal portion 16. Ahandle locking mechanism 20 (FIG. 7 ) is also provided. The coupling 18is connectable to a surgical tool 22, such as a reamer, a patellacutting tool, a rasp or a broach, to enable controlled manipulation ofthat tool. FIGS. 1A and 1B illustrates embodiments of an orthopedicreamer 22 having different attachment member cross-sectional geometries.It is noted that while FIGS. 1A and 1B illustrate embodiments of anorthopedic reamer, the surgical tool handle 10 of the present inventionmay be used with a variety of non-limiting surgical tools.

FIGS. 2, 3, 3A, 4, 4A, 5 and 5A illustrate embodiments of the coupling18 comprising an annular sidewall 24 that extends outwardly from aplatform 26. The annular sidewall 24 preferably extendscircumferentially around an imaginary longitudinal axis A-A. Inaddition, the annular sidewall 24 is preferably spaced from longitudinalaxis A-A. In a preferred embodiment, a length 28 of the sidewall 24extends distally along the axis from the coupling platform 26.

As illustrated in FIGS. 2 and 3 , the coupling 18 may comprise anoverhang portion 30 that preferably extends from a distal end 32 of thesidewall 24. More preferably, the overhang portion 30 extends aboutperpendicular to the longitudinal axis A-A. In addition, each of theoverhang portions 30 extends at least part way towards the longitudinalaxis A-A.

As shown in FIGS. 2, 3, 3A, 4, 4A, 5 and 5A, a series of couplinggrooves 34 extend through the sidewall 24 and the overhang 30 portionsto provide a bayonet type fitting for connection to the attachmentmember 36 (FIGS. 1A, 1B and 3 to 5 ) of a surgical tool 22. In apreferred embodiment, each of the coupling grooves 34 comprises a firstopening portion 38 positioned about perpendicular to a second openingportion 40. While four coupling grooves 34 spaced apart from each otherby 90° are shown, it is contemplated by the present inventors that atleast two diametrically opposed coupling grooves are needed to securelyhold a reamer to the handle 10. More specifically, the first openingportion 38 extends from a top surface 42 of the coupling sidewall 24through the overhang portion 30 and into open communication with thesecond opening portion 40. As shown in FIGS. 3 to 5 , a height 44 of thefirst opening portion 38 extends about parallel to longitudinal axis A-Athrough the overhang portion 30 and may also extend at least part-waythrough the height of the sidewall 24 of the coupling 18. A width 46 ofthe second opening portion 40 of the coupling groove 34 extends througha width of the sidewall 24 and along at least a portion of the annularperimeter of the sidewall 24 extending from the coupling platform 26.

In a preferred embodiment, the width 46 of the second opening portion 40is greater than a width 48 of the first opening portion 38. Eachcoupling groove 34 is constructed such that at least a portion of theattachment member 36 of a surgical tool 22 is first fitted through thefirst coupling groove opening portion 38 and then into the second grooveopening portion 40. Once the attachment member 36 is positioned withinthe second opening 40, the tool 22 is then rotated either in a clockwiseor counter clockwise direction about the longitudinal axis A-A tocapture the attachment member 36 between a top surface 50 of thecoupling platform 26 and a bottom surface 52 of the second openingportion 40. In a preferred embodiment, as illustrated in FIGS. 3 and 3A,the second opening portion 40 of the coupling groove 34 comprises a leftside inlet 54 having a curved cross-section and a right side inlet 56having a rectangular cross-section. Thus, a surgical tool 22 having anattachment member 36 of either a curved or rectangular cross-sectionalgeometry can be received and secured there within. As illustrated inFIGS. 3 and 3A, the cross-sectional geometries of the left and rightside inlets 54, 56 may be interchangeable or reversed.

Therefore, to secure a surgical tool 22 having an attachment member 36of either a curved or a rectangular cross-section to the handle 10, thetool is either rotated within the coupling 18 in a clockwise orcounterclockwise manner. Likewise, to remove the surgical tool 22 fromthe coupling 18, the attachment member 36 is rotated in an oppositedirection to that used to secure the tool to the coupling 18. Forexample, a surgical tool 22 having an attachment member 36 with a curvedcross-section may be rotated in a clockwise manner to seat in the curvedinlet 54 and a surgical tool 22 having a rectangular cross-section maybe rotated in a counter-clockwise direction to seat in the rectangularinlet 56 of the second opening 40 within the coupling 18.

FIGS. 2, 4, 4A, 5 and 5A illustrate embodiments of attachment couplings18 having alternatively different second opening portion 40 geometriesthat may be utilized with the tool handle 10 of the present invention.More specifically, as illustrated in FIGS. 2, 5 and 5A, the secondopening 40 of the coupling groove 34 may be constructed having only acurved inlet 54 (FIG. 3 ). Alternatively, as illustrated in FIGS. 4 and4A, the second opening 40 of the coupling groove 34 may be constructedhaving a combined curved and rectangular cross-sectional inlet. Asshown, the second coupling groove opening 40 transitions from an openinghaving a curved cross-sectional inlet portion to a rectangularcross-sectional inlet portion.

In addition, a series of openings 58, preferably of a cylindrical shape,extend through a thickness 60 of the platform 26 of the coupling 18. Ina preferred embodiment, a lobe portion 59 (FIGS. 4 and 5 ) projectsoutwardly from the outer perimeter of the platform 26. The lobe portion59 provides an outward extension of the coupling platform in which atleast one opening 58 extends therethrough as shown in FIGS. 1, 2, 4 and5 . A pin 66 preferably extends through each of the platform openings58. As illustrated in FIGS. 1, 6 and 7 , each of the collar pins 66 issecured within a slidable collar 68 that resides circumferentiallyaround the shaft 12 and adjacent to a bottom surface 70 of the couplingplatform 26. In a preferred embodiment, each of the pins 66 ispositioned at a distal end 76 of the collar. The collar 68 further has alength that extends axially along the longitudinal axis A-A from acollar proximal end 78 to the collar distal end 76. The collar distalend 76 is contactable to the bottom surface 70 of the coupling platform26.

As shown in FIGS. 6 and 7 , a first bias member 80 resides between theshaft 12 and the collar 68. More specifically, the first bias member 80resides between a distal lip portion 86 of the collar 68 and a first setring 88 positioned circumferentially around an exterior surface 82 ofthe shaft 12 adjacent to the proximal collar end 78. As illustrated, thedistal lip portion 86 extends about perpendicular from the interiorsurface of the collar 68. A gap between the end of the distal lipportion 86 and the exterior surface 82 of the shaft. 12 enables thecollar 68 to slide axially in both a proximal and a distal directionalong the shaft 12. As the collar 68 is slid in a proximal direction,the distal lip 86 compresses the first bias member 80 against the firstset ring 88, thereby creating a bias force acting in the opposite,distal direction. When the collar 68 is released, this bias force movesthe collar 68 and attached collar pins 66 in a distal direction towardsthe coupling platform 26. Once the collar 68 is released, the collarpins 66 preferably traverse into and through the openings 58 of thecoupling platform 26 and into the second opening portion 40 (FIGS. 3A,4A, 5 and 5A) of the coupling groove 34. In a preferred embodiment, eachof the collar pins 66 secures the attachment member 36 of the surgicaltool 22 within its respective curved or rectangular cross-sectionalinlet 54, 56 of the second opening 40 of the coupling groove 34. Morespecifically, each of the collar pins 66 is designed to extend throughthe coupling platform 76 and into the opening 40 to block and therebyprevent movement of the attachment member 36 out of the correspondinglyshaped inlet 54, 56 of the second opening 40.

As illustrated in FIGS. 6 and 7 , in addition to the collar 68 and pins66, the handle locking mechanism 20 comprises a locking pistonsubassembly 90. As illustrated, the locking piston subassembly 90comprises a rod 92 extending to a proximal key 92A and a distal shoulder92B. In a preferred embodiment, at least a portion of the locking pistonsubassembly 90 resides within the distal portion 16 of the shaft 12.More specifically, at least a portion of the locking piston subassembly90 resides within a cylindrically-shaped cavity 100 extending axiallyalong the distal end of the shaft 12. As shown in FIGS. 6 and 7 , therod 92 extends from the proximal key 92A to the distal contact plate 120located distal to the distal shoulder 92B. The distal contact plate 120has a socket 106. The proximal key 92A has, for example, an oblong shapeprovided with a lateral length that is significantly greater than itswidth with respect to the longitudinal axis A-A.

The proximal key 92A of the locking piston subassembly 90 is received ina key compartment 96 having an opening 96A that permits the proximal keyto be moved axially out of the key compartment 96 using a hand tool (notshown) having a driver end that is matable with the socket 106.Likewise, the distal shoulder 92B abuts a distal lock ring 97 that islocated proximal to the coupling platform 26. That way, when the driverend of the hand tool mated to the socket 106 is manipulated to rotatethe locking piston subassembly 90 to align the proximal key 92A with thekey compartment opening 96A, the distal shoulder 92B is permitted tomove axially in a distal direction until the shoulder contacts lock ring97.

Thus, with the driver end of the hand tool received in the socket 106,the hand tool is manipulated to rotate the rod 92 including the proximalkey 92A so that the oblong shape of the key 92A matches the oblong shapeof the key compartment opening 96A. In that manner, the locking pistonsubassembly 90 is partially movable out of the cylindrically-shapedcavity 100 extending axially along the distal end of the shaft 12 tofacilitate cleaning the cavity 100 and the locking piston subassembly90. Spaced apart openings 68A through the slidable collar 68 permitaccess between the shaft 12 and the collar for cleaning there.

As shown in FIG. 7 , a second bias member 94 biases between the proximalkey compartment 96 and the distal shoulder 92B of the locking pistonsubassembly 90. This biasing force causes the distal contact plate 120provided with the socket 106 to extend distally and outwardly past thecoupling platform. That way, when a surgical tool 22 having anattachment member 36 of a curved cross-section is seated in the curvedinlet 54 or a surgical tool 22 having a rectangular cross-section isseated in the rectangular inlet 56 of the second opening 40 within thecoupling 18, the distal contact plate 120 exerts an axial force againstthe attachment member to help secure the surgical tool in positionreceived in the respective curved or rectangularly-shaped inlets 54, 56of the second opening 40 of the coupling groove 34. This includes therespectively shaped curved or rectangular portions of the combined inletshown in FIGS. 4 and 4A.

In operation, to engage the attachment member 36 of a surgical tool 22within the coupling 18, the collar 68 is moved in a proximal directionaway from the coupling platform 26. This action moves the collar pins 66in a proximal direction, removing them from within the openings 58 ofthe coupling platform 26 so that the collar pins 66 do not protrude pastthe top surface 50 of the platform. Once the collar pins 66 are removedfrom the coupling platform 26, the attachment member 36 of the surgicaltool 22 is positioned within the coupling grooves 34. First, theattachment member 36 is positioned through the first opening portion 38and then within the second opening portion 40 of the coupling groove 34.In an embodiment, the attachment member 36 of the surgical tool 22 ispreferably either rotated in a clockwise or counterclockwise mannerdepending upon the geometry of the cross-section of the attachmentmember, as previously discussed.

In a preferred embodiment, positioning the attachment member 36 withinthe coupling 18 forces the external surface of the attachment member 36to act against the distal contact plate 120 of the locking pistonsubassembly 90, thereby proximally compressing the spring 94 within thecavity 100 of the shaft distal end 16. Simultaneously, the second biasmember 94 provides a counter bias force acting against the attachmentmember 36 of the surgical tool 22. In a preferred embodiment, the secondbias member 94 exerts an opposing force in a distal axial directionagainst the distal shoulder 92B, thereby exerting a force against atleast a portion of the attachment member 36 of the surgical tool 22.Thus, movement and play of the surgical tool 22 within the coupling 18is minimized.

After the attachment member 36 of the surgical tool 22 is positionedwithin the second opening 40 of the coupling groove 34, the collar 68 isreleased to move back to its original distal location. As the collar 68is released, the bias force created by the first bias member 80 movesthe collar pins 66 through the openings 58 of the coupling platform 26of the coupling 18, thereby further securing the attachment member 36and the surgical tool 22 within the handle assembly 10.

It is appreciated that various modifications to the invention conceptsdescribed herein may be apparent to those skilled in the art withoutdeparting from the spirit and the scope of the present invention definedby the hereinafter appended claims.

According to the present disclosure, a surgical tool handle is providedwhich is configured for connecting to a surgical tool, the surgical toolhandle comprising:

-   -   a) a shaft comprising a shaft sidewall having a shaft length        extending along a longitudinal axis from a shaft proximal end to        a shaft distal portion having a shaft distal end, wherein the        shaft has a shaft cavity comprising a cavity sidewall extending        proximally from the shaft distal end part-way along the shaft        length to a cavity end wall;    -   b) a coupling comprising an annular coupling sidewall extending        distally from the distal shaft end, wherein at least two spaced        apart coupling grooves extend proximally from a distal end of        the coupling sidewall, each coupling groove comprising a primary        axial inlet in open communication with a secondary inlet with at        least a portion of the secondary inlet being radially offset        from the primary inlet so that a distal portion of the coupling        sidewall is aligned axially with respect to the secondary inlet;    -   c) a collar supported on the shaft in an axially movable        relationship with respect to the shaft sidewall, the collar        being proximal the coupling, wherein a distal end of the collar        supports at least two distally extending collar pins;    -   d) a first coil spring extending from a first coil spring        proximal end abutting a protrusion extending radially outwardly        from the shaft sidewall to a first coil spring distal end        abutting the collar, wherein with the first coil spring biasing        the collar in a distal direction toward the coupling, the at        least two collar pins extend through openings in the coupling to        reside at least in part in the primary axial inlet of respective        ones of the coupling grooves; and    -   e) a locking mechanism comprising:        -   i) a rod received in the shaft cavity and extending from a            rod proximal end to a distal contact plate; and        -   ii) a second coil spring comprising a spring lumen receiving            the rod, wherein the second coil spring extends from a            second coil spring proximal end abutting a wall in the shaft            cavity to a second coil spring distal end abutting a            shoulder comprising the rod,    -   f) wherein the collar is manipulatable in a proximal direction        against the bias of the first coil spring to remove the at least        two collar pins from the coupling grooves, and    -   g) wherein a surgical tool is then manipulatable in an axial        direction with respect to the longitudinal axis of the shaft to        move an attachment member of the surgical tool into the primary        inlets of the coupling grooves and then the surgical tool is        rotatable in one of a clockwise or counterclockwise direction to        position the attachment member in the secondary inlets of the        coupling grooves with the second coil spring biasing the distal        contact plate in a distal direction into contact with the        surgical tool attachment member, and    -   h) wherein the collar is further manipulatable to permit the        first coil spring to then bias the collar in a distal direction        to position the at least two collar pins into the primary inlets        of the respective coupling grooves with the distal portions of        the coupling sidewall blocking the attachment member from moving        axially out of the secondary inlets of the coupling grooves to        thereby securely connect the surgical tool to the coupling of        the surgical tool handle.

According to the present disclosure, the annular coupling sidewallextends distally from a coupling platform supported at the shaft distalend, and wherein the first coil spring biases the collar in the distaldirection abutting the coupling with the at least two collar pinsextending through the openings in the coupling platform so that the pinsreside in the primary axial inlets of the coupling grooves.

According to the present disclosure, the first coil spring distal endabuts a distal collar lip extending radially inwardly toward the shaftsidewall.

According to the present disclosure, the distal contact plate isextendable outwardly past the shaft distal end of the shaft cavity.

According to the present disclosure, a key compartment resides in aproximal portion of the shaft cavity, and wherein the rod proximal endcomprises a proximal key residing in the key compartment, and whereinthe distal contact plate is manipulatable to rotate the rod about thelongitudinal axis to align the proximal key with an opening in the keycompartment so that the proximal key is removable from the keycompartment to thereby at least partially remove the locking mechanismfrom the shaft cavity.

According to the present disclosure, the rod comprises a distal shoulderlocated proximal the contact plate, and the shaft supports a distal lockring extending inwardly toward the longitudinal axis, and wherein, withthe proximal key removed from the key compartment, the distal shoulderof the rod is configured to abut the lock ring to thereby prevent thelocking mechanism from being completely removed from the keycompartment.

According to the present disclosure, the at least two coupling groovesare diametrically opposed to each other.

According to the present disclosure, the at least two distally extendingcollar pins each have a respective pin axis aligned parallel to, butspaced from the longitudinal axis.

According to the present disclosure, the secondary inlet of each of theat least two coupling grooves is configured to receive a surgical toolattachment member of either a curved cross-section or a rectangularcross-section.

According to the present disclosure, the coupling comprises four spacedapart coupling grooves extending proximally from the distal end of thecoupling sidewall.

According to the present disclosure, the four coupling grooves arespaced apart 90° from each other.

According to the present disclosure, the distal contact plate at thedistal end of the rod comprises a socket.

According to the present disclosure, with a surgical tool connected tothe coupling as the second coil spring biases the distal contact platein the distal direction into contact with the surgical tool attachmentmember, the collar is manipulatable in a proximal direction against thebias of the first coil spring to remove the at least two collar pinsfrom the respective coupling grooves, and wherein the surgical tool isthen rotatable in the other of the clockwise or counterclockwisedirection to move the attachment member from the secondary inlet andinto the primary inlet of the coupling grooves, and then the surgicaltool is further manipulatable in a distal direction with respect to thelongitudinal axis of the shaft to move the attachment member out of theprimary inlet of the coupling grooves to thereby disconnect the surgicaltool from the surgical tool handle.

According to the present disclosure, the at least two coupling groovesare configured to connect to the attachment member of a surgical toolselected from the group consisting of a reamer, a rasp, and a patellacutter.

According to the present disclosure, a surgical tool handle is providedwhich is configured for connecting to a surgical tool, the surgical toolhandle comprising:

-   -   a) a shaft comprising a shaft sidewall having a shaft length        extending along a longitudinal axis from a shaft proximal end to        a shaft distal portion having a shaft distal end, wherein the        shaft has a shaft cavity comprising a cavity sidewall extending        proximally from the shaft distal end part-way along the shaft        length to a cavity end wall;    -   b) a coupling comprising an annular coupling sidewall extending        distally from the shaft distal end, wherein at least two spaced        apart coupling grooves extend proximally from a distal end of        the coupling sidewall, each coupling groove comprising a primary        axial inlet in open communication with a secondary inlet and a        ternary inlet with at least a portion of the secondary and        ternary inlets being radially offset in opposite directions with        respect to the primary inlet so that distal portions of the        coupling sidewall are aligned axially with respect to the        secondary and ternary inlets, wherein the secondary inlet is        configured to receive a surgical tool attachment member having        one of a curved cross-section and a rectangular cross-section        and the ternary inlet is configured to receive an attachment        member of the other of the curved cross-section and the        rectangular cross-section;    -   c) a collar supported on the shaft in an axially movable        relationship with respect to the shaft sidewall, the collar        being proximal the coupling, wherein a distal end of the collar        supports at least two distally extending collar pins;    -   d) a first coil spring extending from a first coil spring        proximal end abutting a protrusion extending radially outwardly        from the shaft sidewall to a first coil spring distal end        abutting the collar, wherein with the first coil spring biasing        the collar in a distal direction toward the coupling, the at        least two collar pins extend through openings in the coupling to        reside at least in part in the primary axial inlet of respective        ones of the coupling grooves; and    -   e) a locking mechanism comprising:        -   i) a rod received in the shaft cavity and extending from a            rod proximal end to a distal contact plate; and        -   ii) a second coil spring comprising a spring lumen receiving            the rod, wherein the second coil spring extends from a            second coil spring proximal end abutting a wall of the shaft            cavity to a second coil spring distal end abutting a            shoulder comprising the rod,    -   f) wherein the collar is manipulatable in a proximal direction        against the bias of the first coil spring to remove the at least        two collar pins from the coupling grooves, and    -   g) wherein a surgical tool is then manipulatable in an axial        direction with respect to the longitudinal axis of the shaft to        move an attachment member of a surgical tool into the primary        inlet of the coupling groove and then the surgical tool is        rotatable in one of a clockwise or counterclockwise direction to        position the attachment member in one of the secondary inlet and        the ternary inlet of the coupling groove corresponding to a        cross-sectional configuration of the attachment member with the        second coil spring biasing the distal contact plate in a distal        direction into contact with a proximal surface of the surgical        tool attachment member, and    -   h) wherein the collar is further manipulatable to permit the        first coil spring to then bias the collar in a distal direction        to position the at least two collar pins into the primary inlets        of the respective coupling grooves with the distal portion of        the coupling sidewall blocking the attachment member from moving        axially out of the secondary inlet or the ternary inlet of the        coupling groove to thereby securely connect the surgical tool to        the coupling of the surgical tool handle.

According to the present disclosure, with a surgical tool connected tothe coupling as the second coil spring biases the distal contact platein the distal direction into contact with the surgical tool attachmentmember, the collar is manipulatable in a proximal direction against thebias of the first coil spring to remove the at least two collar pinsfrom the respective coupling grooves, and wherein the surgical tool isthen rotatable in the other of the clockwise or counterclockwisedirection to move the attachment member from the secondary inlet or theternary inlet and into the primary inlet of the coupling grooves, andthen the surgical tool is further manipulatable in a distal directionwith respect to the longitudinal axis of the shaft to move theattachment member out of the primary inlet of the coupling grooves tothereby disconnect the surgical tool from the surgical tool handle.

According to the present disclosure, a surgical tool handle is providedwhich is configured for connecting to a surgical tool, the surgical toolhandle comprising:

-   -   a) a shaft comprising a shaft sidewall having a shaft length        extending along a longitudinal axis from a shaft proximal end to        a shaft distal portion having a shaft distal end, wherein the        shaft has an axial shaft cavity comprising a cavity sidewall        extending proximally from the shaft distal end part-way along        the shaft length to a cavity end wall;    -   b) a coupling comprising an annular coupling sidewall extending        distally from a coupling platform supported at the shaft distal        end, wherein four spaced apart coupling grooves extend        proximally from a distal end of the coupling sidewall, the        coupling grooves being spaced apart 90° from each other, and        wherein each coupling groove comprises a primary axial inlet in        open communication with a secondary inlet with at least a        portion of the secondary inlet being radially offset with        respect to the primary inlet so that a distal portion of the        coupling sidewall is aligned axially with respect to the        secondary inlet, wherein the secondary inlets of a first        diametrically opposed pair of the four inlets is configured to        receive a surgical tool attachment member having one of a curved        cross-section and a rectangular cross-section and the secondary        inlets of a second diametrically opposed pair of the four inlets        is configured to receive a surgical tool attachment member        having the other of the curved cross-section and the rectangular        cross-section;    -   c) a collar supported on the shaft in an axially movable        relationship with respect to the shaft sidewall, the collar        being proximal the coupling, wherein a distal end of the collar        supports four distally extending collar pins;    -   d) a first coil spring extending from a first coil spring        proximal end abutting a protrusion extending radially outwardly        from the shaft sidewall to a first coil spring distal end        abutting the collar, wherein with the first coil spring biasing        the collar in a distal direction toward the coupling, the four        collar pins extend through openings in the coupling platform to        reside at least in part in the primary axial inlet of respective        ones of the coupling grooves; and    -   e) a locking mechanism comprising:        -   i) a rod received in the shaft cavity and extending from a            proximal rod end to a distal contact plate; and        -   ii) a second coil spring comprising a spring lumen receiving            the rod, wherein the second coil spring extends from a            second coil spring proximal end abutting the cavity end wall            to a second coil spring distal end abutting a shoulder            comprising the rod,    -   f) wherein the collar is manipulatable in a proximal direction        against the bias of the first coil spring to remove the four        collar pins from the coupling grooves, and    -   g) wherein a surgical tool is then manipulatable in an axial        direction with respect to the longitudinal axis of the shaft to        move an attachment member of the surgical tool into the primary        inlets of either the first or second diametrically opposed pairs        of the coupling grooves that has the secondary inlet configured        to mate with either a curved cross-section or a rectangular        cross-section of the attachment member of the surgical tool, and        then the surgical tool is rotatable in one of a clockwise or        counterclockwise direction to position the attachment member in        the mating coupling grooves of the secondary inlets of the        corresponding cross-sectional configuration with the second coil        spring biasing the distal contact plate in a distal direction        into contact with the surgical tool attachment member, and    -   h) wherein the collar is further manipulatable to permit the        first coil spring to then bias the collar in a distal direction        to position the collar pins into the primary inlets of the        respective coupling grooves with the distal portion of the        coupling sidewall blocking the attachment member from moving        axially out of the secondary inlets of the coupling grooves to        thereby securely connect the surgical tool to the coupling of        the surgical tool handle.

According to the present disclosure, with a surgical tool connected tothe coupling as the second coil spring biases the distal contact platein the distal direction into contact with the surgical tool attachmentmember, the collar is manipulatable in a proximal direction against thebias of the first coil spring to remove the at least two collar pinsfrom the respective first or second diametrically opposed pairs of thecoupling grooves, and wherein the surgical tool is then rotatable in theother of the clockwise or counterclockwise direction to move theattachment member from the secondary inlet and into the primary inlet ofthe coupling grooves, and then the surgical tool is furthermanipulatable in a distal direction with respect to the longitudinalaxis of the shaft to move the attachment member out of the primary inletof the coupling grooves to thereby disconnect the surgical tool from thesurgical tool handle.

What is claimed is:
 1. A surgical tool handle configured to connect to asurgical tool, comprising: a shaft extending along a longitudinal axis,wherein the shaft has a shaft cavity; a coupling disposed at a distalend of the surgical tool handle, the coupling comprising an annularcoupling sidewall, wherein at least two spaced apart coupling groovesextend proximally from a distal end of the coupling, each couplinggroove comprising a primary axial inlet in open communication with asecondary inlet, wherein, with respect to the longitudinal axis, atleast a portion of the secondary inlet is offset radially from theprimary axial inlet such that a distal portion of the coupling sidewallis aligned axially with the secondary inlet; a collar disposed on theshaft, wherein the collar is movable along the longitudinal axis withrespect to the shaft, the collar being proximal the coupling, whereinthe collar comprises at least two collar pins extending with thelongitudinal axis; a first coil spring extending from a first coilspring proximal end abutting a protrusion of the shaft to a first coilspring distal end abutting the collar, wherein, with the first coilspring biasing the collar in a distal direction toward the coupling,each of the at least two collar pins being in an extended position in arespective one of the primary axial inlets of the coupling grooves; alocking mechanism comprising (i) a rod received in the shaft cavity andextending from a rod proximal end to a distal contact plate, and (ii) asecond coil spring received in the shaft cavity with the rod, whereinthe second coil spring extends from a second coil spring proximal endabutting a wall in the shaft cavity to a second coil spring distal endabutting a shoulder disposed on the rod, with the second coil springbiasing the distal contact plate in the distal direction; and whereinthe collar is movable along the longitudinal axis in a proximaldirection against the bias of the first coil spring to retract the atleast two collar pins from the extended position in the primary axialinlets of the coupling grooves, and further movable along thelongitudinal axis in the distal direction with the bias of the firstcoil spring to return the at least two collar pins to the extendedposition in the primary axial inlets of the coupling grooves.
 2. Thesurgical tool handle of claim 1, wherein the coupling comprises acoupling platform and the annular coupling sidewall extends distallyfrom a coupling platform, and wherein the first coil spring biases thecollar in the distal direction abutting the coupling with the at leasttwo collar pins extending through respective openings in the couplingplatform to the respective one of the primary axial inlets of thecoupling grooves.
 3. The surgical tool handle of claim 1, wherein thefirst coil spring distal end abuts a distal collar lip extendingradially inwardly toward the shaft sidewall.
 4. The surgical tool handleof claim 1, wherein the distal contact plate is extendable outwardlypast a distal end of the shaft cavity.
 5. The surgical tool handle ofclaim 1, wherein a key compartment resides in a proximal portion of theshaft cavity, and wherein the rod proximal end comprises a proximal keyresiding in the key compartment, and wherein the distal contact plate ismanipulatable to rotate the rod about the longitudinal axis to align theproximal key with an opening in the key compartment such that theproximal key is removable from the key compartment to at least partiallyremove the locking mechanism from the shaft cavity.
 6. The surgical toolhandle of claim 5, wherein the shoulder disposed on the rod is locatedproximal the distal contact plate, and the shaft supports a distal lockring extending inwardly toward the longitudinal axis, and wherein, withthe proximal key removed from the key compartment, the shoulder disposedon the rod is configured to abut the lock ring to prevent the lockingmechanism from being completely removed from the shaft cavity.
 7. Thesurgical tool handle of claim 1, wherein the at least two couplinggrooves are diametrically opposed to each other.
 8. The surgical toolhandle of claim 1, wherein the at least two collar pins each have arespective pin axis aligned parallel to, but spaced from thelongitudinal axis.
 9. The surgical tool handle of claim 1, wherein thesecondary inlet of each of the at least two coupling grooves isconfigured to receive a surgical tool attachment member of either acurved cross-section or a rectangular cross-section.
 10. The surgicaltool handle of claim 1, wherein the coupling comprises four spaced apartcoupling grooves which extend proximally from the distal end of thecoupling.
 11. The surgical tool handle of claim 10, wherein the fourcoupling grooves are spaced apart 90° from each other.
 12. The surgicaltool handle of claim 1, wherein the distal contact plate comprises asocket.
 13. The surgical tool handle of claim 1, wherein the at leasttwo coupling grooves are configured to connect to an attachment memberof a surgical tool.
 14. The surgical tool handle of claim 1, wherein,when the collar is moved in the proximal direction against the bias ofthe first coil spring, the at least two collar pins retract from theprimary axial inlets of the coupling grooves such that a surgical toolis then manipulatable along the longitudinal axis to move an attachmentmember of the surgical tool into the primary axial inlets of thecoupling grooves and then the surgical tool is rotatable in one of aclockwise direction or a counterclockwise direction to position theattachment member in the secondary inlets of the coupling grooves withthe second coil spring biasing the distal contact plate in the distaldirection into contact with the surgical tool attachment member and thedistal portions of the coupling sidewall aligned axially with thesecondary inlets blocking the attachment member from moving axially outof the secondary inlets of the coupling grooves; and wherein, when thecollar is further moved in the distal direction with the bias of thefirst coil spring, the at least two collar pins extend into therespective primary axial inlets of the coupling grooves such that the atleast two collar pins block the attachment member from rotating out ofthe secondary inlets of the coupling grooves.